<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        .box {
            width: 500px;
            height: 200px;
            margin: 30px auto 0;
            border: 1px solid black;
            background-image: repeating-linear-gradient(red, yellow 10%, green 20%);
            background-image: linear-gradient(red, yellow);
            background-image: linear-gradient(to right, red, yellow);
            background-image: linear-gradient(to bottom right, red, yellow);
            background-image: linear-gradient(-90deg, red, yellow);
            background-image: linear-gradient(0deg, red, yellow);
            background-image: linear-gradient(90deg, red, yellow);
            background-image: linear-gradient(1200deg, red, yellow);
            background-image: linear-gradient(-120deg, red, yellow);
            background-image: linear-gradient(-90deg, red, yellow);
            background-image: radial-gradient(circle, red, yellow, green);
            background-image: radial-gradient(red 5%, yellow 15%, green 60%);
            background-image: radial-gradient(red, yellow, green);
        }

        .box2 {
            width: 500px;
            height: 500px;
            margin: 30px auto 0;
            border: 1px solid black;
            background-image: radial-gradient(circle, red 5%, yellow 15%, green 60%);
        }
    </style>
</head>
<body>
    <div class="box2"></div>
    <div class="box"></div>
</body>
</html>